The Effect of Surface Conditions in Determination of High Carbon Austenite Phase Volume Fraction by XRD Method in Austempered Ductile Iron

Öz

Östemperlenmiş Küresel Grafitli Dökme Demirlerde XRD Yöntemiyle Yüksek Karbonlu Östenit Faz Hacim Oranını Belirlemede Yüzey Koşullarının Etkisi

Öz

Bu çalışmada XRD (X-Işınları kırınımı) yöntemiyle yüksek karbonlu östenit faz hacim oranı belirlenmesinde yüzey koşullarının yüksek karbonlu östenit faz hacim oranı üzerine etkisi araştırılmıştır. Böylelikle XRD analizinde uygun yüzey koşulunun belirlenmesi hedeflenmiştir. Bu amaç doğrultusunda, alaşımlı küresel grafitli dökme demire 900°C’de 2 saat östenitleme ve 375°C’deki tuz banyosunda 2 saat östemperleme ve ardından oda sıcaklığına havada soğutma işlemi uygulanmıştır.

Isıl işlem sonrası dört eşit parçaya ayrılarak farklı yüzey koşullarında hazırlanan numuneler optik ve SEM ile incelenmiş, XRD analizleri yapılmış ve makro sertlik ölçümleri gerçekleştirilmiştir.

XRD yöntemiyle yüksek karbonlu östenit faz hacim oranı ölçümlerinde farklı yüzey koşullarının östenit faz hacim oranı ölçümü üzerinde oldukça etkili olduğu gözlemlenmiştir. XRD yöntemiyle faz hacim oranı belirlenmesinde polisaj+dağlama işleminin yüzey pürüzlülüğünü azalttığı için oldukça etkili olduğu tespit edilmiştir.

Anahtar Kelimeler

• Östemperlenmiş Küresel Grafitli Dökme Demir (ÖKGDD),Yüksek Karbonlu Östenit Faz Hacim Oranı,Yüzey Pürüzlülüğü,XRD (X-Işınları Kırınımı)

Kaynakça

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